3500 seems a bit late to me also, 2600 to 2800 more reasonable. Multiple carbs I have no experience with so it will have to be you to be the pioneer. Webers were also my dream, so much so that I almost converted three to EFI. Block all passages and use the internal cavity to house the IAC and the idle air feeding the other two carbs. I had it all planned out and converted the center carb before deciding to make my own intake using acommon plenum for easier tuning. Still love the look!
